Band-saw mill



(No Model.)

T. S. WILKIN.

BAND SAWMILL.

No. 432,683. Patented July 22, 1890.

w H H H 9 E E J I H l W H o 9 W w NI'TED STATES PATENT OFFICE.

THEODORE S. VILKIN, OF MILIVAUKEE, XVISOONSIN.

BAN D-SAW MILL.

SPECIFICATION forming part of Letters Patent No. 432,683, dated July 22, 1890.

' Application filed March 1, 1890. Serial No. 342,248. (No model.)

To aZZ whom it may concern.-

Be it known that I, THEODORE S. WILKIN, a citizen of the United States, residing at Milwaukee, in the countyof Milwaukee and State has reference more particulary to a novel construction and arrangement of devices for maintaining the proper tension upon the saw.

In the drawings, Figure l is a side view, partly in section, of a portion of a band-saw mill, showing my invention applied thereto; Fig. 2, a vertical sectional view on the line 2 2 of Fig. 1; Fig. 3, a horizontal sectional view on the line 3 3 of Fig. 2.

A indicates the frame of the saw-mill, which may be of any desired construction; 13, the

lower saw-wheel shaft provided with a sawcarrying wheel 0, and D the upper shaft carrying the upper saw-carrying wheel E. The shaft D is carried at its ends in suitable boxes or bearings F F, which in turn are supported by hollow posts or pedestals G G, which are designed to move vertically through the upright hollow extensions I-IH of the main frame.

Extending upward into each of the hollow posts or pedestals G G is a rod I, which will advisably be provided at both ends with knifeedges, as shown, the lower ends of said rods being supported bya system of levers K and L, pivoted at opposite ends to the main frame. In the drawings I have shown three of these levers K connected at their free ends by a cross-bar or plate a, having a V-shaped recess on its upper face to receive a correspon din glyshaped end of one of the rods I, and I have also shown two levers L, which are connected at their free ends by a similar cross plate or bar a, as will be seen upon reference to Fig. I do not wish, however, to be understood as limiting myself to any special number of levers K and L, for it is apparent that the number may be increased or diminished, as desired, provided only that there be a lever to support each of the rods I.

The levers K and L are arranged parallel to each other and pass through and are supported by a frame or yoke M, which is provided with an upright rod or stem N, carrying at its upper end a plate 0, between which and From the foregoing description it will be observed that the action of the springs P tends to raise the frame or yoke M and carry with it the levers K L, and in thus raising lift the rods I, which are carried or supported by the outer or free ends of the levers, and thereby maintain a constant tension upon the saw. It will also be observed that the yoke or frame M acts as an equalizer, so that if it should happen from any cause that one series of le Vers be raised or lowered more or less than the other series such variation in the movement of the levers would not cause an irreglr lar movement of the saw-carrying wheel E. So, too, it will by apparent that by adjusting the nut 6 upon the upper end of the rod or stem N the tension of the spring or springs may be varied or controlled to increase or decrease the action of the said spring.

A weight might be substituted for the springs P; but I prefer the springs, as there is less liability to vibration.

I am aware that it is not broadly new to support a single bearing for the upper sawwheel shaft by means of springs, and that levers have been used for supporting the end bearings of the upper saw-wheel shaft, and to these features I make no broad claim.

Having thus described my invention, what I claim isl. I11 a band-saw mill, the combinatiomwith the main frame and the saw-carrying wheels 0 E, of the boxes or bearings F F for the shaft of the wheel E, levers K and L, pivoted to the main frame at opposite ends, a yoke or frame M, supporting said levers at a point between their ends, a spring supporting the yoke or frame, and rods resting at their lower ends upon the levers K L and supporting at their upper endsthe boxes or bearings F.

2. In a band-saw mill, the combinatiomwith the fixed shaft B and its wheel U, of the vertically-adjustable shaft D, provided with a wheel E, a series of levers K L, pivoted at opposite ends to the main frame, a yoke or frame supporting said levers at a point between their ends, upright rods resting at their lower ends upon the levers and adapted to support the upper saw-carrying wheel and its shaft, and a spring acting upon the yoke or frame and adapted, substantially as shown and described, to maintain a constant and uniform tension upon the saw.

3. I11 aband-saw mill, the combinatiolnwith the main frame, of the levers K L, pivoted at their opposite ends, a shaft D, provided with a saw-carrying wheel E, intermediate connecting mechanism, substantially such as shown, between the shaft and levers, an equalizing yoke or frame at a point between their ends, and a spring acting in conjunction with said equalizing yoke or frame, all substantially as shown, whereby both ends of the shaft will be raised and lowered-equally and uniformly.

4. In combination with frame A, shafts B D, and wheels 0 E, boxes F F, and pedestals G G, supporting the ends of the shaft D, pivoted levers K and L, rods 1, bearing at opposite ends against the pedestals and the levers, a yoke M, supporting the levers at a point between their ends and provided with an upwardly -extending stem N, a plate 0, and springs P, interposed between the plate 0 and the main frame, all substantially as shown.

5. In a band-saw mill, the cornbination,with the vertical adjustable shaft D, levers K L, and intermediate connections arranged substantially as shown, of the yoke M, supporting saidlevers and provided with wheels or rollers 0, ways or guides formed upon the main frame-to receive the rollers, and a spring acting in conjunction with the yoke or frame to create the necessary tension upon the saw.

In witness whereof I hereunto set my hand in the presence of two witnesses.

THEODORE S. \VILKIN. WVit-nesscs:

JOHN W. MORRIS, A. H. SoUTHwELL. 

